Capacitive keyboard works on the principle of measuring changes in capacity in presence of a conductive object (for example finger). Based on this principle, sensors like buttons, sliders, switches, touchpads, touchscreens, proximity sensors and others can be created.

The Capacitive Keyboard product was made for capacitive sensor’s capabilities demonstration. According to customer requirements, it can be modified (number and types of sensors, their geometry, graphic design of overlay foil/glass/polycarbonate).

The advantages of capacitive keyboard are long lifetime (absence of mechanical parts), easy maintenance (washable), high IP protection and user attractive appearance.

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Standard Capacitive Keyboard modification possibilities

• 1 to 46 capacitive sensors
• shield electrode support for reliable operation in the presence of water film or droplets
• sensing possible with up to a 15 mm glass overlay
• sensing support through high resistive conductive materials (ITO films for example)
• proximity detection to 20 cm with a wire-based sensor
• high immunity to AC mains noise, EMC noise, and power supply voltage changes
• supports different combinations of independent and slide capacitive sensors
• increase slide sensor resolution using interpolation
• touchpad support with two slide sensors
• integrated baseline update algorithm for handling temperature, humidity, and electrostatic discharge (ESD) events
• PC GUI application support for parameter optimization in real time

Microcontroller with CapSense^® support

• Power supply: 3.0V - 5.25V
• GPIO: 12 - 50
• CapSense^® sensors: 8 - 44
• Analog blcks: 0 - 6
• Digital blocks: 0 - 4
• CapSense^® slider: 1 - 8 (min. 5 sensors for 1 slider)
• Flash memory: 8 - 32kB
• RAM: 512 - 2048 bytes
• Communication interface: I2C, SPI, UART, USB
• Packages: 16 SOIC, 20 SSOP, 32 QFN, 100 VFBGA

CapSense^® and PSoC^® are registered trademarks of Cypress Semiconductor Corp. All other trademarks or registered trademarks referenced herein are property of the respective corporations.